<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div>
        <box>
            <p class="title"></p>
            <ul class="list">
                <li class="child1">我是第1个</li>
                <li class="child2">我是第2个</li>
                <li class="child3">我是第3个</li>
            </ul>
            <div id="box2"></div>


        </box>
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</body>

</html>